I can't throw away this CD, Because I have so much memories on this.
There are a lots of memories on this CD, It's difficult for me to throw away.
I can't throw away this CD, Because I have so much memories on this.
There are a lots of memories on this CD, It's difficult for me to throw away.
などのように、思い出がたくさんあってＣＤを捨てることができない。と表現すれば、自分がとっておきたい気持ちも相手に伝わると思いますよ。ご参考までに。
It is a keepsake because I have strong feelings about it.
例：このCDには思い入れがあるからなかなか捨てられない。記念にとっておくんだ。
This CD has a lot of memories so it is difficult to throw away. It is a keepsake.
思い入れがある – be fond of, feel strongly
記念にとっておく – keepsake, memento
日本 
